Evaluate the expression when x=8\displaystyle {x}={8} by converting the fractions to decimals.

x+0.91+(−x)\displaystyle {x}+{0.91}+{\left(-{x}\right)}

 

Now evaluate the expression when x=8\displaystyle {x}={8} by using the commutative property of addition to add opposites first.

x+(−x)+0.91\displaystyle {x}+{\left(-{x}\right)}+{0.91}

 

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